Optical transmission system, optical transmitter for optical...

Details Optical transmission system, optical transmitter for optical... Optical transmission system, optical transmitter for optical...

2005-03-17

2010-06-08

Liu, Li (Department: 2613)

Optical communications

Receiver

Including postcompensation

C398S188000, C398S140000, C398S158000, C398S163000, C398S183000, C398S212000, C398S213000

Reexamination Certificate

active

07734194

ABSTRACT:
An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set. The optical receiver (2) has an infinitesimal-modulated signal component detection circuit (222), which uses the signal train output from a balanced detection circuit (221) to detect the infinitesimal-modulated signal component applied to the phase adjustment terminal (201) of an MZI (200) by an infinitesimal-modulated signal oscillation circuit (224); a synchronous detection circuit (223), which synchronously detects the infinitesimal-modulated signals output from the infinitesimal-modulated signal component detection circuit (222) and infinitesimal-modulated signal oscillation circuit (224) and detects the error signal component arising from the shift between the optical signal carrier frequency and the optical frequency characteristic of the MZI (200); and a controller (207), which outputs a control signal to adjust the phase difference between two split optical signals output from the MZI (200) so as to correct the shift amount.

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